40204520706561 has 16 divisors (see below), whose sum is σ = 54190358006400. Its totient is φ = 26511171982848.

The previous prime is 40204520706547. The next prime is 40204520706569. The reversal of 40204520706561 is 16560702540204.

It is not a de Polignac number, because 40204520706561 - 2³⁸ = 39929642799617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40204520706569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39923941 + ... + 40918578.

It is an arithmetic number, because the mean of its divisors is an integer number (3386897375400).

Almost surely, 2^{40204520706561} is an apocalyptic number.

It is an amenable number.

40204520706561 is a deficient number, since it is larger than the sum of its proper divisors (13985837299839).

40204520706561 is a wasteful number, since it uses less digits than its factorization.

40204520706561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80844328.

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 40204520706561 in words is "forty trillion, two hundred four billion, five hundred twenty million, seven hundred six thousand, five hundred sixty-one".